File.SetLastAccessTimeUtc Method

Sets the date and time, in coordinated universal time (UTC), that the specified file was last accessed.

Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)

public static void SetLastAccessTimeUtc (
	string path,
	DateTime lastAccessTimeUtc
public static void SetLastAccessTimeUtc (
	String path, 
	DateTime lastAccessTimeUtc
public static function SetLastAccessTimeUtc (
	path : String, 
	lastAccessTimeUtc : DateTime



The file for which to set the access date and time information.


A DateTime containing the value to set for the last access date and time of path. This value is expressed in UTC time.

Exception typeCondition


path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.


path is a null reference (Nothing in Visual Basic).


The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.


The specified path was not found.


The caller does not have the required permission.


path is in an invalid format.


lastAccessTimeUtc specifies a value outside the range of dates or times permitted for this operation.

The path parameter is permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.

The following table lists examples of other typical or related I/O tasks.

To do this...

See the example in this topic...

Write to a text file.

How to: Write Text to a File

Read from a text file.

How to: Read Text from a File

Append text to a file.

How to: Open and Append to a Log File



Rename or move a file.



Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1